EM73880 Просмотр технического описания (PDF) - ELAN Microelectronics
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EM73880 Datasheet PDF : 40 Pages
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EM73880
4-BIT MICRO-CONTROLLER FOR LCD PRODUCT
address 8192 x 8 bits
Preliminary
000h
Reset start address
002h
INT0; External interrupt service routine entry address
004h
HTCI; High speed timer interrupt service entry address
006h
TRGA; Timer/counterA interrupt service routine entry address
008h
TRGB; Timer/counter B interrupt service routine entry address
00Ah TBI; Time base interrupt service routine entry address
00Ch SPI
00Eh
086h
SCALL, subroutine call entry address
80...0h 1000
LCALL entry
address
FFFh
fixed data area
Bank1
1FFF
User's program and fixed data are stored in the program ROM. User's program is according the PC value
to send next executed instruction code . Fixed data can be read out.
The program counter is a 13-bit binary counter. The PC can defined 8K ROM.
Table -look-up instruction is depended on the Data Pointer (DP) to indicate to ROM address, then to get the
ROM code data. The fixed data only can be put in bank1.
LDAX
LDAXI
Acc ← ROM[DP]L
Acc
←
ROM[DP] ,DP+1
H
DP is a 12-bit data register which can store the program ROM address to be the pointer for the ROM code
data. First, user load ROM address into DP by instruction "STADPL, STADPM, STADPH", then user can
get the lower nibble of ROM code data by instruction "LDAX" and higher nibble by instruction "LDAXI"
PROGRAM EXAMPLE: Read out the ROM code of address 1777h by table-look-up instruction.
LDIA #07h;
STADPL ; DP2-0 ← 07h
STADPM ; DP5-3 ← 07h
STADPH ; DP8-6 ← 07h, Load DP=777h
:
LDL #00h;
LDH #03h;
LDAX
; ACC ← 6h
STAMI ; RAM[30] ← 6h
LDAXI ; ACC ← 5h
STAM
; RAM[31] ← 5h
;
ORG 1777H
DATA 56H;
:
DATA RAM ( 244-nibble )
There is total 244 - nibble data RAM from address 00 to F3h
Data RAM includes 3 parts: zero page region, stacks and data area.
* This specification are subject to be changed without notice.
11.30.2001 4
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